Memory Subsystem Physics

DDR4 / DDR5 RAM Latency & 1% Lows Predictor

Calculate exact True First-Word Latency (ns), theoretical dual-channel bandwidth (GB/s), memory controller gear modes (1:1 UCLK:MCLK), and predict 1% low frame stutter eliminations.

True First-Word Latency

10ns (Nanoseconds)

Rating: Optimal Sweet Spot

Dual-Channel Memory Bandwidth

96GB/s

Data transfer rate at 6000 MT/s DUAL Channel.

Predicted 1% Low Frame Rate

90FPS (+5.5%)

Baseline: 85 FPS in CPU-bound games.

RAM Timing & Platform Controls

RAM Generation

CPU Platform & Socket

Memory Data Rate (Frequency)6000 MT/s (MHz)

CAS Latency (tCL / Primary Timing)CL 30

DIMM Channel Architecturedual Channel

Memory Controller Mode1:1 UCLK:MCLK (Optimal AM5)

First-Word Latency Calculation:

True Latency = (CL 30 ? 2000) / 6000 MT/s = 10 ns

Sub-10ns memory provides instantaneous CPU draw-call servicing during fast asset loads.

Platform Architectural Verdict:

AMD Ryzen 7000/9000 (AM5) hits maximum IPC gaming performance at DDR5-6000 CL30, running Memory Controller (UCLK) in perfect 1:1 sync (3000MHz). Exceeding 6400 MT/s forces 1:2 Gear mode, worsening latency.

? Excellent memory latency (10 ns). Smooth frametime pacing in open-world CPU-heavy games.

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